Tabletop lifting-type furniture

Abstract

To provide tabletop lifting-type furniture for preventing a distributing cable from getting in the way when an upper support body is fixed to a lower surface of a tabletop, and preventing a fixture, etc. for fixing the upper support body to the tabletop from getting in the way when wires are inserted.SOLUTION: Tabletop lifting-type furniture comprises: a tabletop 2; a plurality of lower structures each including a lower support body, an upper support body 4 and lifting legs 10; a control unit; and an operation unit provided at a front of the tabletop 2, transmitting a lifting / lowering operation signal to the control unit, and electrically connected to the control unit. The upper support body 4 includes a tabletop fixing part 41 to be fixed to the lower surface 22d of the tabletop 2, a hanging part 43 extending downward from the tabletop fixing part 41, and an extension part 44 supported by the hanging part 43, disposed at a different position in a horizontal direction from the tabletop fixing part 41, with the hanging part 43 interposed therebetween, when viewed in the front-rear direction, and forming a wire insertion space 48 through which a distributing cable 16c for connecting the operation unit and the control unit can be inserted between itself and the lower surface 22d of the tabletop 2.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a furniture unit with a liftable top. [Background technology]

[0002] Conventionally, in offices, public facilities, etc., furniture with a top such as a desk or table, which has a top on which various tasks can be performed, has been used. In furniture with a top, the height of the top that is easy to work on varies from person to person depending on the posture, physique, sex, preference, etc. of the user. Since furniture with a fixed top height cannot meet such a situation, furniture with a lifting top that can change the height of the top in the vertical direction is widely used. Furthermore, many furniture with a lifting top that uses an electric lifting unit as a lifting means to automatically change the height of the top up and down and improve the operability of the lifting means is adopted.

[0003] Such a lifting tabletop fixture generally comprises a plurality of legs including a lifting unit for raising and lowering the tabletop, and a tabletop supported by the plurality of legs.Furthermore, the lifting tabletop fixture may comprise a control unit for controlling the lifting unit, and an operation unit operated by a user to send a lifting / lowering operation signal to the control unit, and the operation unit may be provided in front of the tabletop.

[0004] A tabletop lifting fixture has been proposed in which an upper support placed on the top of the legs includes a tabletop mounting section fixed to the underside of the tabletop with screws, a pair of downward sections extending downward from both sides of the tabletop mounting section, and a wiring holder extending from the lower end of one of the pair of downward sections toward the opposing downward section (see Patent Document 1 below). The wiring cable connecting the operation section and the control unit is placed above the wiring holder of the upper support. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6459037 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the lift-top type fixture disclosed in Patent Document 1, when the top plate mounting part of the upper support is fixed to the top plate with screws after the wiring cable is placed in the wiring holding part of the upper support, the wiring cable placed above the wiring holding part gets in the way of the screwing work. On the other hand, when the top plate mounting part of the upper support is fixed to the top plate with screws, the wiring cable is inserted into the wiring holding part of the upper support, and the screws get in the way when inserting the wiring cable.

[0007] Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and provides a tabletop lifting fixture that does not get in the way of wiring cables when fixing the upper support to the underside of the tabletop, and does not get in the way of fastening devices that fix the upper support to the tabletop when inserting the wiring. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following means. In other words, the lifting table fixture of the present invention comprises a tabletop, a lower support placed on the floor surface, an upper support placed above the lower support and fixed to the tabletop, and multiple lower structures having lifting legs that connect the upper support and the lower support and are extendable and contractable in the vertical direction, a control unit that controls the extension and contraction operation of the lifting legs, and an operation unit provided at the front of the tabletop and sending lifting operation signals to the control unit and electrically connecting the control unit, wherein the upper support has a tabletop fixing portion fixed to the underside of the tabletop, a hanging portion extending downward from the tabletop fixing portion, and an extension portion supported by the hanging portion and positioned at a different position in the left-right direction from the tabletop fixing portion when viewed in the front-to-back direction, forming a wiring insertion space through which a wiring cable connecting the operation unit and the control unit can be inserted between the underside of the tabletop.

[0009] In a lift-top fixture configured in this manner, the extension portion disposed below the top-top fixing portion of the upper support is disposed at a different position in the left-right direction from the top-top fixing portion when viewed in the front-to-rear direction. The wiring cable inserted into the wiring insertion space of the extension portion is disposed on the opposite side of the top-top fixing portion across the hanging portion. Therefore, when the top-top fixing portion is fixed to the underside of the top plate with a fastener such as a bolt after the wiring cable is disposed in the wiring insertion space above the extension portion, the wiring cable disposed in the wiring insertion space does not interfere with fixing the fastener. Furthermore, when the wiring cable is inserted into the wiring insertion space after the top-top fixing portion is fixed to the underside of the top plate with the fastener, the fastener does not interfere with inserting the wiring cable.

[0010] In addition, in the lift-top type furniture of the present invention, the wiring insertion space may be open to the side opposite the top fixing portion in the left-right direction.

[0011] In the lift-top fixture constructed in this way, when the wiring cable is inserted into the wiring insertion space above the extension part, it can be inserted from the underside of the top plate and from the side opposite the top plate fixing part in the left-right direction, making it easy to arrange the wiring cable. Also, the side where the wiring insertion space is open can be secured widely as a working space for inserting the wiring cable into the wiring insertion space.

[0012] In addition, in the tabletop lifting fixture of the present invention, the extension portion extends in the front-to-back direction and is positioned toward the center in the left-right direction relative to the tabletop fixing portion, and the upper support body may have a lateral concealment portion extending downward from the side opposite the center in the left-right direction of the tabletop fixing portion.

[0013] In a lift-top fixture configured in this manner, the extension portion extends in the front-to-rear direction and is positioned closer to the center in the left-right direction than the top-top fixing portion. The upper support has a side concealing portion that extends downward from the side opposite the center in the left-right direction of the top-top fixing portion. Therefore, the side concealing portion can hide the fastener that fixes the top-top fixing portion to the underside of the top from the side, improving the appearance. A wiring cable can be inserted from the center in the left-right direction into the wiring insertion space above the extension portion, ensuring a wide space on the center in the left-right direction as a work space.

[0014] In addition, in the lifting tabletop fixture of the present invention, the upper support body may extend upward from the extension portion, face the hanging portion in the left-right direction, and have a portion for regulating movement of the distribution cable.

[0015] In a lift-top fixture configured in this manner, the restricting portion extends upward from the extension portion and faces the hanging portion in the left-right direction. Therefore, the distribution cable arranged above the extension portion is positioned in the left-right direction between the hanging portion and the restricting portion, and is prevented from falling from the extension portion.

[0016] In addition, in the lifting tabletop fixture of the present invention, a gap may be formed between the upper end of the regulating portion and the underside of the tabletop.

[0017] In the lift-top fixture configured in this manner, a gap is formed between the upper end of the restricting part and the underside of the top plate, so that the wiring cable can be inserted into the upper side of the extension part through the gap between the upper end of the restricting part and the underside of the top plate, and the wiring cable can be easily positioned above the extension part.

[0018] In addition, in the tabletop lifting fixture of the present invention, the extension portion extends in the front-to-back direction, the front end portion of the extension portion is positioned rearward of the front end portion of the tabletop fixing portion, and the operating portion is positioned forward of the extension portion.

[0019] In a lift-top fixture configured in this way, the front end of the extension is located behind the front end of the tabletop fixing part, and the operating part is located in front of the extension, so that the operating part can be located close to the upper support in a plan view, thereby ensuring a large space below the tabletop. Effect of the Invention

[0020] With the lift-top display fixture of the present invention, wiring cables do not get in the way when fixing the upper support to the underside of the top, and fasteners that fix the upper support to the top do not get in the way when inserting the wiring. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a perspective view of the liftable tabletop fixture of the first embodiment, seen from above and the front. [Diagram 2] FIG. 2 is a perspective view from above and the front of the liftable tabletop fixture of the first embodiment with the tabletop removed. [Diagram 3] FIG. 2 is a perspective view showing the configuration of an upper support body of the liftable tabletop fixture of the first embodiment. [Figure 4] 2 is a cross-sectional view showing the configuration of an upper support of the liftable tabletop fixture of the first embodiment. FIG. [Diagram 5] FIG. 2 is a diagram illustrating the arrangement of wiring cables in the lift-top type furniture of the first embodiment. [Figure 6] A cross-sectional view showing the configuration of an upper support body of a lift-top type furniture of the second embodiment. [Figure 7] A cross-sectional view showing the configuration of an upper support body of a lift-top type furniture of the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] (First embodiment) Hereinafter, the first embodiment of the liftable tabletop fixture will be described with reference to the drawings. 1 is a perspective view from above and the front of a furniture unit with a liftable top according to a first embodiment. The furniture unit with a liftable top according to the embodiment is, for example, a desk 1 with a liftable top.

[0023] In this application, the Z direction, X direction, and Y direction of the Cartesian coordinate system are defined as follows. The Z direction is the up-down direction of the desk 1 with adjustable top. The +Z direction is upward, and the -Z direction is downward. The X direction is the front-to-rear direction of the desk 1 with adjustable top. The +X direction is backward, and the -X direction is forward. The direction approaching the center in the front-to-rear direction of the desk 1 with adjustable top is the inside in the front-to-rear direction, and the direction moving away from the center in the front-to-rear direction is the outside in the front-to-rear direction. The Y direction is the left-to-right direction of the desk 1 with adjustable top. The direction approaching the center in the left-to-right direction of the desk 1 with adjustable top is the inside in the left-to-right direction, and the direction moving away from the center in the left-to-right direction is the outside in the left-to-right direction.

[0024] As shown in FIG. 1, the height-adjustable desk 1 includes a tabletop 2, a plurality of lower structures 3, an operation switch 16, and a control unit 20 shown in FIG.

[0025] As shown in Fig. 1, the tabletop 2 is a flat plate parallel to the XY plane. The tabletop 2 is rectangular in plan view. The length direction of the short side of the tabletop 2 is the front-rear direction, and the length direction of the long side is the left-right direction. The upper surface of the tabletop 2 is a work surface.

[0026] In general, a user of the height-adjustable desk 1 uses the height-adjustable desk 1 by positioning in front of the top 2. In this case, the usable edge of the top 2 is the front of the top 2, and the unused edge of the top 2 is a direction other than the front of the top 2. When the top 2 is rectangular, the unused edge of the top 2 is the rear and sides.

[0027] The multiple lower structures 3 are provided at both left and right ends of the top board 2. In this embodiment, two lower structures 3 are provided. However, three or more lower structures 3 may be provided.

[0028] The lower structure 3 includes an upper arm 4, a lifting leg 10, and a lower arm 8. The upper arm 4 corresponds to an upper support in the claims. The lower arm 8 corresponds to a lower support in the claims.

[0029] The upper arm 4 is fixed to the underside of the tabletop 2. The upper arm 4 extends in the front-rear direction. The length of the upper arm 4 in the front-rear direction is slightly shorter than the length of the tabletop 2 in the front-rear direction. A pair of upper arms 4 are disposed at both ends of the tabletop 2 in the left-right direction. The upper arms 4 are disposed above the lower arms 8 and the lifting legs 10.

[0030] The lifting legs 10 are disposed below the upper arm 4. The upper ends of the lifting legs 10 are fixed to the upper arm 4. The lifting legs 10 are disposed in the center of the tabletop 2 in the front-to-rear direction. The width of the lifting legs 10 in the front-to-rear direction is small. A pair of lifting legs 10 are disposed at both ends of the tabletop 2 in the left-to-right direction.

[0031] FIG. 2 is a perspective view from above and the front of the height-adjustable desk 1 with the top 2 removed. 2, the lifting leg 10 has an extension section 12 and a lifting unit 14. In this embodiment, the extension section 12 and the lifting unit 14 are configured as separate bodies, but the lifting unit 14 may be incorporated into the extension section 12 to be configured as an integrated unit.

[0032] The telescopic unit 12 has a plurality of square tubes. The plurality of square tubes are arranged coaxially with respect to a central axis parallel to the vertical direction. The lower end of the outermost square tube is connected to the lower arm 8. The upper end of the innermost square tube is connected to the lifting unit 14 and also to the upper arm 4. The telescopic unit 12 connects the upper arm 4 and the lower arm 8. The telescopic unit 12 telescopes in the vertical direction as the plurality of square tubes move relative to each other in the vertical direction. The telescopic unit 12 may have a plurality of cylinders, and the shape can be set appropriately.

[0033] The lifting unit 14 extends and retracts the telescopic section 12 in the up and down direction. An electric motor and the like are arranged inside the lifting unit 14. The lifting unit 14 is in the shape of a roughly rectangular parallelepiped box. The lifting unit 14 is arranged above the telescopic section 12. The upper end of the telescopic section 12 is connected to the outer ends in the left and right direction of the lower surface of the lifting unit 14. The lifting unit 14 may be arranged inside the innermost rectangular tube of the telescopic section 12, and the installation position can be set appropriately.

[0034] The lifting unit 14 is connected to a beam member 50 (described later) and the upper arm 4 via a first mounting bracket 17. The lifting unit 14 is connected to the upper arm 4 via a second mounting bracket 18.

[0035] A cover member 19 is provided to conceal the front side and the inside in the left and right direction of the lifting unit 14. The cover member 19 conceals the lifting unit 14, which improves appearance. The cover member 19 is detachable from the desk 1 with a liftable top.

[0036] 5, the cover member 19 has a bottom wall portion 19a, a front wall portion 19b erected from the front portion of the bottom wall portion 19a, and a side wall portion 19c erected from the inside in the left-right direction of the bottom wall portion 19a. The lower end of the rear end portion of the side wall portion 19c is cut out so that the distribution cables 14c, 16c can be inserted between the rear end portion of the side wall portion 19c and the beam member 50.

[0037] As shown in Fig. 2, the lower arm 8 is placed on the floor surface. The lower arm 8 is placed below the lifting legs 10. The lower arm 8 extends in the front-rear direction. The center of the lower arm 8 in the front-rear direction is fixed to the lower end of the lifting legs 10. The pair of lower arms 8 are placed at both ends of the tabletop 2 in the left-right direction.

[0038] The two upper arms 4 arranged at a distance in the left-right direction are connected by a beam member 50. Both left-right ends of the beam member 50 are fixed to the upper ends of the upper arms 4. The beam member 50 is also fixed to the tabletop 2. The beam member 50 assists the synchronous lifting and lowering movements of the pair of lifting legs 10. By connecting the beam member 50 to the pair of upper arms 4, the supporting strength of the tabletop 2 can be increased.

[0039] The tabletop 2 is supported by a pair of upper arms 4 and a beam member 50. The tabletop 2 can be raised and lowered in the vertical direction by the lifting legs 10 extending and retracting in the vertical direction. This allows the user to select the height of the tabletop 2 that is most convenient for work depending on their posture, physique, gender, preferences, etc.

[0040] The beam member 50 is formed by press molding a steel plate material. The cross section of the beam member 50 perpendicular to the left-right direction is generally J-shaped with the height of the front wall being shorter than the height of the rear wall. Various wiring (cables) can be inserted into the internal space 52 of the beam member 50. The beam member 50 has an opening 53 that communicates between the internal space 52 and the external space. The opening 53 opens forward.

[0041] The operation switch 16 is a switch operated by the user to raise and lower the tabletop 2. The operation switch 16 is fixed to the front of the underside of the front part of the tabletop 2. The operation switch 16 is located near one end of the tabletop 2 in the left-right direction. In this embodiment, the operation switch 16 is located on the underside of the tabletop 2, more inward than the right end. As long as the operation switch 16 is provided on the front part of the tabletop 2, the position of the operation switch 16 in the left-right direction can be set appropriately. The operation switch 16 corresponds to the operation unit in the claims.

[0042] The operation switch 16 is electrically connected to the control unit 20. A wiring cable 16c of the operation switch 16 extends rearward from the operation switch 16 and is connected to the control unit 20. The control unit 20 controls the extension and retraction operation of the extension section 12.

[0043] The control unit 20 is placed on a wiring tray (not shown) fixed to the top board 2 or the beam member 50. The control unit 20 is disposed approximately in the center in the left-right direction. A wiring cable 14c of the lifting unit 14 extends from the control unit 20. A pair of wiring cables 14c extends corresponding to the lifting units 14 of the pair of lifting legs 10. The wiring cable 14c passes through a through hole 50h of the beam member 50 and is disposed in the internal space 52. The wiring cable 14c extends outward in the left-right direction along the internal space 52. The connectors at the ends of the pair of wiring cables 14c are inserted into the corresponding sockets of the lifting units 14. Although the control unit 20 is disposed approximately in the center in the left-right direction, the position of the control unit 20 can be set appropriately.

[0044] When a user operates the operation switch 16, the operation switch 16 transmits a lifting / lowering operation signal corresponding to the operation content to the control unit 20. The control unit 20 transmits a drive signal (electrical signal) corresponding to the lifting / lowering operation signal to the lifting / lowering unit 14. The lifting / lowering unit 14 extends and retracts the extension / retraction section 12 in response to the drive signal. As a result, the tabletop 2 is raised and lowered in the vertical direction according to the operation of the user.

[0045] Fig. 3 is a perspective view showing the configuration of the upper arm 4. Fig. 4 is a cross-sectional view showing the configuration of the upper arm 4. Fig. 5 is a diagram explaining the wiring of the wiring of the lift-top lift-top furniture of the desk 1. 3, upper arm 4 has tabletop fixing portion 41, outer hanging portion 42, inner hanging portion 43, extension portion 44, and restricting portion 45. Outer hanging portion 42 corresponds to a side concealing portion in the claims. Inner hanging portion 43 corresponds to a hanging portion in the claims.

[0046] The tabletop fixing part 41 is formed in a flat plate shape. The plate surface of the tabletop fixing part 41 faces the up-down direction. As shown in Fig. 5, the length in the front-rear direction of the tabletop fixing part 41 is slightly shorter than the length in the front-rear direction of the tabletop 2. The length in the front-rear direction of the tabletop fixing part 41 is longer than half the length in the front-rear direction of the tabletop 2.

[0047] A mounting hole 41h penetrating in the up-down direction is formed in the top board fixing portion 41. A plurality of mounting holes 41h are formed at intervals in the front-rear direction of the top board fixing portion 41.

[0048] As shown in Fig. 4, the tabletop fixing part 41 is disposed along the lower surface 22d of the tabletop 2. In this embodiment, the tabletop 2 is configured by joining an upper plate part 21, the upper surface of which is a work surface, and a lower plate part 22, which is disposed below the upper plate part 21, with a gap therebetween in the vertical direction. The lower surface of the lower plate part 22 corresponds to the lower surface 22d of the tabletop 2. The tabletop 2 may be configured from a single plate material, and the configuration of the tabletop 2 can be set appropriately.

[0049] The bolt 23 is inserted into the mounting hole 41h of the top plate fixing part 41 and fastened to the nut 24 provided on the upper side of the lower plate part 22. This fixes the top plate fixing part 41 to the top plate 2. It is sufficient that the bolt 23 is fastened to the nut 24 provided on the upper side of the lower plate part 22 in at least one mounting hole 41h out of the multiple mounting holes 41h.

[0050] The outer hanging portion 42 extends downward from the outer end of the tabletop fixing portion 41 in the left-right direction. The outer hanging portion 42 is provided over substantially the entire length of the tabletop fixing portion 41 in the front-rear direction. The outer hanging portion 42 is disposed slightly inward in the left-right direction from directly below the left-right end 2s of the tabletop 2. As shown in FIG. 2, the front-rear direction central portion 42a of the outer hanging portion 42 extends downward further than other portions in the front-rear direction. The outer hanging portion 42 may be disposed directly below the end 2s of the tabletop 2, may protrude outward in the left-right direction from the end 2s of the tabletop 2, or may be set back significantly inward from the end 2s of the tabletop 2. The central portion 42a of the outer hanging portion 42 does not have to extend downward further than other portions.

[0051] As shown in FIG. 3, the inner hanging portion 43 extends downward from the inner end of the tabletop fixing portion 41 in the left-right direction. The inner hanging portion 43 is provided in an area excluding the center portion in the front-to-rear direction of the tabletop fixing portion 41. The inner hanging portion 43 is provided in two places, one in front of the center of the tabletop fixing portion 41 in the front-to-rear direction and one in rear of the center. The inner hanging portion 43 is provided in a position where it does not interfere with the lifting unit 14. As shown in FIG. 4, a space S1 is formed so as to be surrounded by the tabletop fixing portion 41, the outer hanging portion 42, and the inner hanging portion 43. The space S1 is used when fixing the tabletop fixing portion 41 to the tabletop 2 with the bolts 23.

[0052] Extension portion 44 is supported by the lower end of inner hanging portion 43. Extension portion 44 is disposed at a different position in the left-right direction from tabletop fixing portion 41 across inner hanging portion 43 when viewed in the front-rear direction. Extension portion 44 extends inward in the left-right direction from the lower end of inner hanging portion 43. Extension portion 44 is disposed more inward in the left-right direction than tabletop fixing portion 41. Extension portion 44 may be provided in the middle of inner hanging portion 43 in the up-down direction. Although extension portion 44 on the front side is shown in FIG. 3, extension portion 44 is also provided on the rear side.

[0053] Extension portion 44 extends in the front-to-rear direction. Extension portion 44 is provided in a portion closer to the center in the front-to-rear direction of inner hanging portion 43. Extension portion 44 is not provided near front-to-rear end portion 43a of inner hanging portion 43. Front-to-rear end portion 44a of extension portion 44 is located closer to the center in the front-to-rear direction than end portion 43a of inner hanging portion 43. Front-to-rear end portion 44a of extension portion 44 is located closer to the center in the front-to-rear direction than front-to-rear end portion 41a of top board fixing portion 41.

[0054] A front end 44a of the extension portion 44 is disposed rearward of a front end 44a of the tabletop fixing portion 41. As shown in Fig. 5, the operation switch 16 is disposed forward of the front end 44a of the extension portion 44. The operation switch 16 is disposed inside in the left-right direction of the front end 43a of the inner hanging portion 43. When viewed in the front-rear direction, at least a portion of the operation switch 16 is disposed overlapping with the extension portion 44.

[0055] 4, a wiring insertion space 48 is formed above the extension portion 44 and below the lower surface 22d of the top plate 2. A wiring cable 16c that connects the operation switch 16 and the control unit 20 is disposed in the wiring insertion space 48. The wiring cable 16c is placed on an upper surface 44u of the extension portion 44. Note that a wiring cable other than the wiring cable 16c may be inserted into the wiring insertion space 48.

[0056] As shown in FIG. 4, the restricting portion 45 extends upward from the inner end of the extension portion 44 in the left-right direction. The restricting portion 45 faces the inner hanging portion 43 in the left-right direction. The restricting portion 45 restricts the left-right movement of the wiring cable 16c. A gap 49 is formed between the upper end of the restricting portion 45 and the lower surface 22d of the top plate 2. Through the gap 49, the wiring insertion space 48 is opened to the inside in the left-right direction. The wiring cable 16c can be inserted into the wiring insertion space 48 from the inside in the left-right direction through the gap 49.

[0057] As shown in Fig. 3, a notch 19d is formed in the front wall portion 19b of the cover member 19 so that the rear end portion of the extension portion 44 can be inserted therein. As shown in Fig. 5, the wiring cable 14c of the operation switch 16 extends in the front-rear direction along the upper surface 44u of the extension portion 44 and is inserted inside the cover member 19. The wiring cable 14c extends inward in the left-right direction from the front side of the lifting unit 14 inside the cover member 19. The wiring cable 14c is inserted into the internal space 52 of the beam member 50 and extends in the left-right direction, and is connected to the control unit 20 through a through hole 50h.

[0058] In the thus configured lift-up desk 1, the extension 44 disposed below the top fixing part 41 of the upper arm 4 is disposed at a different position in the left-right direction from the top fixing part 41 when viewed in the front-rear direction. The wiring cable 16c inserted into the wiring insertion space 48 of the extension 44 is disposed on the opposite side of the top fixing part 41 across the inner hanging part 43. Therefore, when the wiring cable 16c is disposed in the wiring insertion space 48 above the extension 44 and then the top fixing part 41 is fixed to the lower surface 22d of the top 2 with the bolt 23, the wiring cable 16c disposed in the wiring insertion space 48 does not interfere with the bolt fastening. In addition, when the wiring cable 16c is inserted into the wiring insertion space 48 after the top fixing part 41 is fixed to the lower surface 22d of the top 2 with the bolt 23, the bolt 23 does not interfere with the insertion of the wiring cable 16c.

[0059] Furthermore, when inserting the wiring cable 16c into the wiring insertion space 48 of the extension portion 44, it can be inserted from below the tabletop 2 and from the side opposite the tabletop fixing portion 41, making it easy to insert the wiring cable 16c.

[0060] Furthermore, when the wiring cable 16c is inserted into the wiring insertion space 48 above the extension portion 44, it can be inserted from below the top plate 2 and from the inside in the left-right direction, making it easy to arrange the wiring cable 16c. Also, the inside in the left-right direction where the wiring insertion space 48 is open can be widely secured as a working space for inserting the wiring cable 16c into the wiring insertion space 48.

[0061] Further, extension portion 44 extends in the front-rear direction and is disposed on the inside in the left-right direction of tabletop fixing portion 41 in a plan view. Outer hanging portion 42 extends downward from the outer end in the left-right direction of tabletop fixing portion 41. Therefore, outer hanging portion 42 can hide bolt 23 that fixes tabletop fixing portion 41 to underside 22d of tabletop 2 from the outside in the left-right direction, improving the appearance.

[0062] In addition, the extension portion 44 is disposed on the inside in the left-right direction relative to the tabletop fixing portion 41, and the wiring insertion space 48 is open on the inside in the left-right direction opposite the tabletop fixing portion 41. Therefore, the space extending on the inside in the left-right direction can be widely secured as a working space for inserting the wiring cable 16c.

[0063] Furthermore, restricting portion 45 extends upward from extension portion 44 and faces inner hanging portion 43 in the left-right direction. Therefore, distribution cable 16c arranged above extension portion 44 is positioned in the left-right direction between inner hanging portion 43 and restricting portion 45, and is prevented from falling from extension portion 44.

[0064] In addition, a gap 49 is formed between the upper end of the restricting portion 45 and the lower surface 22d of the tabletop 2. Therefore, the wiring cable 16c can be inserted into the upper side of the extension portion 44 from the gap between the upper end of the restricting portion 45 and the lower surface 22d of the tabletop 2, and the wiring cable 16c can be easily arranged on the upper side of the extension portion 44.

[0065] In addition, the front end 44a of the extension part 44 is disposed rearward of the front end 41a of the tabletop fixing part 41, and the operation switch 16 is disposed in front of the extension part 44. Therefore, the operation switch 16 can be disposed close to the upper arm 4 in a plan view, so that a large space can be secured below the tabletop 2.

[0066] Second embodiment Next, a second embodiment of the lift-top type furniture will be described mainly with reference to Fig. 6. In the description of the modified examples shown below, the same members as those described above are given the same reference numerals and the description thereof will be omitted.

[0067] FIG. 6 is a cross-sectional view showing the configuration of an upper support of the liftable tabletop furniture of the second embodiment. 6, the upper arm 4X includes a tabletop fixing portion 41X, an outer hanging portion 43X, an extension portion 44X, and a restricting portion 45X. The outer hanging portion 43X corresponds to the hanging portion in the claims.

[0068] The tabletop fixing portion 41X is disposed along the lower surface 22d of the tabletop 2. The tabletop fixing portion 41X is disposed inside in the left-right direction from the end portion 2s of the tabletop 2. The bolt 23 is inserted through the mounting hole 41h of the tabletop fixing portion 41X and fastened to the nut 24 provided on the upper side of the lower plate portion 22.

[0069] The outer hanging portion 43X extends downward from the outer end of the tabletop fixing portion 41X in the left-right direction. The extension portion 44X is disposed at a different position in the left-right direction from the tabletop fixing portion 41X when viewed in the front-rear direction. The extension portion 44X extends outward in the left-right direction from the lower end of the outer hanging portion 43X. The extension portion 44X is disposed outward in the left-right direction from the tabletop fixing portion 41X. A wiring insertion space 48 is formed above the extension portion 44X and below the lower surface 22d of the tabletop 2. A wiring cable 16c that connects the operation switch 16 and the control unit 20 is disposed in the wiring insertion space 48. The wiring cable 16c is placed on the upper surface 44u of the extension portion 44X.

[0070] The restricting portion 45X extends upward from the outer end of the extension portion 44X in the left-right direction. The restricting portion 45X is disposed directly below the end 2s of the top plate 2. A gap 49 is formed between the upper end of the restricting portion 45X and the lower surface 22d of the top plate 2. The wiring cable 16c can be inserted into the wiring insertion space 48 through the gap 49 from the outside in the left-right direction. The restricting portion 45X may protrude outward in the left-right direction from the end 2s of the top plate 2, or may be set back inward in the left-right direction from the end 2s of the top plate 2.

[0071] In the thus configured lift-top desk 1X, the extension portion 44X disposed below the top fixing portion 41X of the upper arm 4 extends outward in the left-right direction opposite the top fixing portion 41X fixed to the underside 22d of the top 2 in a plan view. The wiring cable 16c inserted into the wiring insertion space 48 of the extension portion 44X is disposed on the opposite side of the top fixing portion 41X across the outer hanging portion 43X. Therefore, when the top fixing portion 41X is fixed to the underside 22d of the top 2 with the bolt 23 after the wiring cable 16c is disposed in the wiring insertion space 48 above the extension portion 44X, the wiring cable 16c disposed in the wiring insertion space 48 does not interfere with the bolt fastening. Furthermore, when the wiring cable 16c is inserted into the wiring insertion space 48 after the tabletop fixing portion 41X is fixed to the underside 22d of the tabletop 2 with the bolt 23, the bolt 23 does not get in the way when inserting the wiring cable 16c.

[0072] Furthermore, when inserting the wiring cable 16c into the wiring insertion space 48 of the extension portion 44X, it is inserted from the outer side in the left-right direction, which is the side opposite to the tabletop fixing portion 41X. It is also possible to insert the wiring cable 16c from the gap 49 by looking at the left-right end portion 2s of the tabletop 2 without looking underneath the tabletop 2, which improves workability.

[0073] Third embodiment Next, a third embodiment of the liftable tabletop fixture will be described with reference mainly to FIG. FIG. 7 is a cross-sectional view showing the configuration of an upper support of a lift-top type furniture of the third embodiment. 7, the upper arm 4Y has a first tabletop fixing portion 41, an outer hanging portion 42, a first inner hanging portion 43, an extension portion 44, a second inner hanging portion 46, a second tabletop fixing portion 41Y, and an upper and lower portion 47. The first tabletop fixing portion 41 and the second tabletop fixing portion 41Y correspond to the tabletop fixing portion in the claims. The first inner hanging portion 43 and the second inner hanging portion 46 correspond to the hanging portion in the claims.

[0074] Second inner hanging portion 46 extends upward from an inner end in the left-right direction of extension portion 44. An upper end of second inner hanging portion 46 abuts against lower surface 22d of table top 2.

[0075] The second tabletop fixing portion 41Y extends inward in the left-right direction from the upper end of the second inner hanging portion 46. The second tabletop fixing portion 41Y is formed in a flat plate shape. The plate surface of the second tabletop fixing portion 41Y faces the up-down direction. The second tabletop fixing portion 41Y has a mounting hole 41h penetrating in the up-down direction. A plurality of mounting holes 41h are formed at intervals in the front-rear direction of the second tabletop fixing portion 41Y. The second tabletop fixing portion 41Y is disposed along the lower surface 22d of the tabletop 2. The bolt 23 is inserted into the mounting hole 41h of the second tabletop fixing portion 41Y and fastened to a nut 24 provided on the upper side of the lower plate portion 22.

[0076] The upper and lower parts 47 extend downward from the inner end in the left-right direction of the second top board fixing part 41Y. The upper and lower parts 47 do not necessarily have to be provided.

[0077] The wiring cable 16c is disposed on an upper surface 44u of the extension portion 44. The wiring cable 16c can be inserted into the wiring insertion space 48 from a portion of the wiring insertion space 48 that opens in the front-rear direction.

[0078] In the thus configured lift-up desk 1Y, the extension portion 44 disposed below the first tabletop fixing portion 41 and the second tabletop fixing portion 41Y of the upper arm 4 is disposed at a different position in the left-right direction from the first tabletop fixing portion 41 and the second tabletop fixing portion 41Y when viewed in the front-rear direction. The wiring cable 16c inserted into the wiring insertion space 48 of the extension portion 44 is disposed on the opposite side of the first tabletop fixing portion 41 across the first inner hanging portion 43 and on the opposite side of the second tabletop fixing portion 41Y across the second inner hanging portion 46. Therefore, when the wiring cable 16c is disposed in the wiring insertion space 48 above the extension portion 44 and then the first tabletop fixing portion 41 and the second tabletop fixing portion 41Y are fixed to the underside 22d of the tabletop 2 with the bolts 23, the wiring cable 16c disposed in the wiring insertion space 48 does not interfere with the bolt fastening. Furthermore, after the first tabletop fixing portion 41 and the second tabletop fixing portion 41Y are fixed to the underside 22d of the tabletop 2 with the bolts 23, when the wiring cable 16c is inserted into the wiring insertion space 48, the bolts 23 do not get in the way when inserting the wiring cable 16c.

[0079] Furthermore, when inserting the wiring cable 16c into the wiring insertion space 48 of the extension portion 44, it can be inserted from the portion of the wiring insertion space 48 that opens in the front-rear direction, making it easy to insert the wiring cable 16c.

[0080] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not deviate from the gist of the present invention are also included.

[0081] In the embodiment described above, the restricting portion 45 is provided extending upward from the extension portion 44, but this is not limited thereto. The extension portion 44 may not be provided with the restricting portion 45. In this case, the wiring insertion space 48 above the extension portion 44 is largely open in either the left or right direction, so that the wiring cable 16c can be easily inserted into the wiring insertion space 48. Also, a configuration may be adopted in which a plurality of restricting portions 45 are formed at intervals in the front-rear direction of the extension portion 44. In this case, the wiring cable 16c can be inserted into the wiring insertion space 48 of the extension portion 44 between the front and rear restricting portions 45.

[0082] In the embodiment described above, a gap 49 is formed between the upper end of the restricting portion 45 and the lower surface 22d of the top plate 2, but this is not limited to this. The upper end of the restricting portion 45 does not have to abut against the lower surface 22d of the top plate 2 so that no gap is formed.

[0083] In the embodiment described above, the operation switch 16 is disposed forward of the front end 44a of the extension portion 44, but this is not limited to the above. The front end 44a of the extension portion 44 may extend to the front end of the tabletop 2, and the operation switch 16 may be disposed inside the extension portion 44 in the left-right direction.

[0084] In the embodiment described above, hanging portion 43 extends vertically downward, but is not limited to this. Hanging portion 43 extends gradually inward in the left-right direction as it extends downward, and may be formed in a flat shape or curved shape, and the shape can be set as appropriate.

[0085] In the embodiment described above, the upper surface 44u of the extension portion 44 is disposed along a horizontal plane, but is not limited thereto. The upper surface of the extension portion 44 may be formed in an arc shape so as to be convex downward.

[0086] In the embodiment described above, the upper arm 4 includes the outer hanging portion 42, but is not limited to this. The upper arm 4 only needs to include at least the tabletop fixing portion 41, the outer hanging portion 42, and the hanging portion 43. [Explanation of symbols]

[0087] 2. Tabletop 3. Undercarriage 4 Upper arm (upper support) 8 Lower arm (lower support) 10 Lifting legs 12 Telescopic part 14 Lifting unit 16 Operation switch (operation section) 14c,16c wiring cable 20 Control Unit 41 Top board fixing part 42 Outer hanging part (lateral concealment part) 43 Inner hanging part (hanging part) 44 Extension section 45 Regulatory Department 48 Wiring insertion space 49 Gap

Claims

1. The top plate and a plurality of lower structures each including a lower support disposed on a floor surface, an upper support disposed above the lower support and fixed to the top plate, and a lifting leg connecting the upper support and the lower support and capable of extending and contracting in the vertical direction; A control unit for controlling the extension and retraction of the lifting legs; an operation unit provided at a front portion of the tabletop, transmitting a lifting operation signal to the control unit and electrically connected to the control unit; The upper support includes: A top board fixing portion fixed to the underside of the top board; A hanging portion extending downward from the top plate fixing portion; A lift-top display fixture having an extension portion that is supported by the hanging portion and is positioned at a different position in the left-right direction from the tabletop fixing portion, sandwiching the hanging portion when viewed in the front-to-back direction, and forms a wiring insertion space between the underside of the tabletop and the extension portion that allows a wiring cable connecting the operating portion and the control unit to be inserted.

2. 2. The lift-top display fixture according to claim 1, wherein the wiring insertion space is open to the side opposite the tabletop fixing portion in the left-right direction.

3. The extension portion extends in the front-rear direction and is disposed closer to the center in the left-right direction than the tabletop fixing portion, The upper support includes:

3. A display unit with a liftable top as described in claim 1 or 2, further comprising a lateral concealment portion extending downward from the opposite side to the center in the left-right direction of the top fixing portion.

4. The upper support includes:

3. A display unit with a liftable top as described in claim 1 or 2, further comprising a portion extending upward from the extension portion, facing the hanging portion in the left-right direction, and regulating movement of the distribution cable.

5. The tabletop lifting fixture according to claim 4, wherein a gap is formed between an upper end of the regulating portion and the underside of the tabletop.

6. The extension portion extends in the front-rear direction, A front end of the extension portion is disposed rearward of a front end of the top board fixing portion, The display unit with a liftable top according to claim 1 or 2, wherein the operating section is disposed in front of the extension section.

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